
<!DOCTYPE HTML>
<html lang="zh-hans" >
    <head>
        <meta charset="UTF-8">
        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
        <title>GIF动画 · Go语言圣经</title>
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="description" content="">
        <meta name="generator" content="GitBook 3.2.3">
        
        
        
    
    <link rel="stylesheet" href="../gitbook/style.css">

    
            
                
                <link rel="stylesheet" href="../gitbook/gitbook-plugin-katex/katex.min.css">
                
            
                
                <link rel="stylesheet" href="../gitbook/gitbook-plugin-highlight/website.css">
                
            
                
                <link rel="stylesheet" href="../gitbook/gitbook-plugin-fontsettings/website.css">
                
            
        

    

    
        
    
        
    
        
    
        
    
        
    
        
    

        
    
    
    <meta name="HandheldFriendly" content="true"/>
    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <link rel="apple-touch-icon-precomposed" sizes="152x152" href="../gitbook/images/apple-touch-icon-precomposed-152.png">
    <link rel="shortcut icon" href="../gitbook/images/favicon.ico" type="image/x-icon">

    
    <link rel="next" href="ch1-05.html" />
    
    
    <link rel="prev" href="ch1-03.html" />
    

    </head>
    <body>
        
<div class="book">
    <div class="book-summary">
        
            
            
                <nav role="navigation">
                


<ul class="summary">
    
    

    

    
        
        
    
        <li class="chapter " data-level="1.1" data-path="../">
            
                <a href="../">
            
                    
                    前言
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.1.1" data-path="../ch0/ch0-01.html">
            
                <a href="../ch0/ch0-01.html">
            
                    
                    Go语言起源
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.1.2" data-path="../ch0/ch0-02.html">
            
                <a href="../ch0/ch0-02.html">
            
                    
                    Go语言项目
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.1.3" data-path="../ch0/ch0-03.html">
            
                <a href="../ch0/ch0-03.html">
            
                    
                    本书的组织
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.1.4" data-path="../ch0/ch0-04.html">
            
                <a href="../ch0/ch0-04.html">
            
                    
                    更多的信息
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.1.5" data-path="../ch0/ch0-05.html">
            
                <a href="../ch0/ch0-05.html">
            
                    
                    致谢
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.2" data-path="ch1.html">
            
                <a href="ch1.html">
            
                    
                    入门
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.2.1" data-path="ch1-01.html">
            
                <a href="ch1-01.html">
            
                    
                    Hello, World
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.2" data-path="ch1-02.html">
            
                <a href="ch1-02.html">
            
                    
                    命令行参数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.3" data-path="ch1-03.html">
            
                <a href="ch1-03.html">
            
                    
                    查找重复的行
            
                </a>
            

            
        </li>
    
        <li class="chapter active" data-level="1.2.4" data-path="ch1-04.html">
            
                <a href="ch1-04.html">
            
                    
                    GIF动画
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.5" data-path="ch1-05.html">
            
                <a href="ch1-05.html">
            
                    
                    获取URL
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.6" data-path="ch1-06.html">
            
                <a href="ch1-06.html">
            
                    
                    并发获取多个URL
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.7" data-path="ch1-07.html">
            
                <a href="ch1-07.html">
            
                    
                    Web服务
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8" data-path="ch1-08.html">
            
                <a href="ch1-08.html">
            
                    
                    本章要点
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.3" data-path="../ch2/ch2.html">
            
                <a href="../ch2/ch2.html">
            
                    
                    程序结构
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.3.1" data-path="../ch2/ch2-01.html">
            
                <a href="../ch2/ch2-01.html">
            
                    
                    命名
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.3.2" data-path="../ch2/ch2-02.html">
            
                <a href="../ch2/ch2-02.html">
            
                    
                    声明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.3.3" data-path="../ch2/ch2-03.html">
            
                <a href="../ch2/ch2-03.html">
            
                    
                    变量
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.3.4" data-path="../ch2/ch2-04.html">
            
                <a href="../ch2/ch2-04.html">
            
                    
                    赋值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.3.5" data-path="../ch2/ch2-05.html">
            
                <a href="../ch2/ch2-05.html">
            
                    
                    类型
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.3.6" data-path="../ch2/ch2-06.html">
            
                <a href="../ch2/ch2-06.html">
            
                    
                    包和文件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.3.7" data-path="../ch2/ch2-07.html">
            
                <a href="../ch2/ch2-07.html">
            
                    
                    作用域
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.4" data-path="../ch3/ch3.html">
            
                <a href="../ch3/ch3.html">
            
                    
                    基础数据类型
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.1" data-path="../ch3/ch3-01.html">
            
                <a href="../ch3/ch3-01.html">
            
                    
                    整型
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.2" data-path="../ch3/ch3-02.html">
            
                <a href="../ch3/ch3-02.html">
            
                    
                    浮点数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.3" data-path="../ch3/ch3-03.html">
            
                <a href="../ch3/ch3-03.html">
            
                    
                    复数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.4" data-path="../ch3/ch3-04.html">
            
                <a href="../ch3/ch3-04.html">
            
                    
                    布尔型
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.5" data-path="../ch3/ch3-05.html">
            
                <a href="../ch3/ch3-05.html">
            
                    
                    字符串
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.6" data-path="../ch3/ch3-06.html">
            
                <a href="../ch3/ch3-06.html">
            
                    
                    常量
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5" data-path="../ch4/ch4.html">
            
                <a href="../ch4/ch4.html">
            
                    
                    复合数据类型
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.1" data-path="../ch4/ch4-01.html">
            
                <a href="../ch4/ch4-01.html">
            
                    
                    数组
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.2" data-path="../ch4/ch4-02.html">
            
                <a href="../ch4/ch4-02.html">
            
                    
                    Slice
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.3" data-path="../ch4/ch4-03.html">
            
                <a href="../ch4/ch4-03.html">
            
                    
                    Map
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.4" data-path="../ch4/ch4-04.html">
            
                <a href="../ch4/ch4-04.html">
            
                    
                    结构体
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.5" data-path="../ch4/ch4-05.html">
            
                <a href="../ch4/ch4-05.html">
            
                    
                    JSON
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.6" data-path="../ch4/ch4-06.html">
            
                <a href="../ch4/ch4-06.html">
            
                    
                    文本和HTML模板
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6" data-path="../ch5/ch5.html">
            
                <a href="../ch5/ch5.html">
            
                    
                    函数
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.6.1" data-path="../ch5/ch5-01.html">
            
                <a href="../ch5/ch5-01.html">
            
                    
                    函数声明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.2" data-path="../ch5/ch5-02.html">
            
                <a href="../ch5/ch5-02.html">
            
                    
                    递归
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.3" data-path="../ch5/ch5-03.html">
            
                <a href="../ch5/ch5-03.html">
            
                    
                    多返回值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.4" data-path="../ch5/ch5-04.html">
            
                <a href="../ch5/ch5-04.html">
            
                    
                    错误
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.5" data-path="../ch5/ch5-05.html">
            
                <a href="../ch5/ch5-05.html">
            
                    
                    函数值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.6" data-path="../ch5/ch5-06.html">
            
                <a href="../ch5/ch5-06.html">
            
                    
                    匿名函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.7" data-path="../ch5/ch5-07.html">
            
                <a href="../ch5/ch5-07.html">
            
                    
                    可变参数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.8" data-path="../ch5/ch5-08.html">
            
                <a href="../ch5/ch5-08.html">
            
                    
                    Deferred函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.9" data-path="../ch5/ch5-09.html">
            
                <a href="../ch5/ch5-09.html">
            
                    
                    Panic异常
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.10" data-path="../ch5/ch5-10.html">
            
                <a href="../ch5/ch5-10.html">
            
                    
                    Recover捕获异常
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.7" data-path="../ch6/ch6.html">
            
                <a href="../ch6/ch6.html">
            
                    
                    方法
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.7.1" data-path="../ch6/ch6-01.html">
            
                <a href="../ch6/ch6-01.html">
            
                    
                    方法声明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.2" data-path="../ch6/ch6-02.html">
            
                <a href="../ch6/ch6-02.html">
            
                    
                    基于指针对象的方法
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.3" data-path="../ch6/ch6-03.html">
            
                <a href="../ch6/ch6-03.html">
            
                    
                    通过嵌入结构体来扩展类型
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.4" data-path="../ch6/ch6-04.html">
            
                <a href="../ch6/ch6-04.html">
            
                    
                    方法值和方法表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.5" data-path="../ch6/ch6-05.html">
            
                <a href="../ch6/ch6-05.html">
            
                    
                    示例: Bit数组
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.6" data-path="../ch6/ch6-06.html">
            
                <a href="../ch6/ch6-06.html">
            
                    
                    封装
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.8" data-path="../ch7/ch7.html">
            
                <a href="../ch7/ch7.html">
            
                    
                    接口
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.8.1" data-path="../ch7/ch7-01.html">
            
                <a href="../ch7/ch7-01.html">
            
                    
                    接口是合约
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.2" data-path="../ch7/ch7-02.html">
            
                <a href="../ch7/ch7-02.html">
            
                    
                    接口类型
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.3" data-path="../ch7/ch7-03.html">
            
                <a href="../ch7/ch7-03.html">
            
                    
                    实现接口的条件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.4" data-path="../ch7/ch7-04.html">
            
                <a href="../ch7/ch7-04.html">
            
                    
                    flag.Value接口
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.5" data-path="../ch7/ch7-05.html">
            
                <a href="../ch7/ch7-05.html">
            
                    
                    接口值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.6" data-path="../ch7/ch7-06.html">
            
                <a href="../ch7/ch7-06.html">
            
                    
                    sort.Interface接口
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.7" data-path="../ch7/ch7-07.html">
            
                <a href="../ch7/ch7-07.html">
            
                    
                    http.Handler接口
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.8" data-path="../ch7/ch7-08.html">
            
                <a href="../ch7/ch7-08.html">
            
                    
                    error接口
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.9" data-path="../ch7/ch7-09.html">
            
                <a href="../ch7/ch7-09.html">
            
                    
                    示例: 表达式求值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.10" data-path="../ch7/ch7-10.html">
            
                <a href="../ch7/ch7-10.html">
            
                    
                    类型断言
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.11" data-path="../ch7/ch7-11.html">
            
                <a href="../ch7/ch7-11.html">
            
                    
                    基于类型断言识别错误类型
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.12" data-path="../ch7/ch7-12.html">
            
                <a href="../ch7/ch7-12.html">
            
                    
                    通过类型断言查询接口
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.13" data-path="../ch7/ch7-13.html">
            
                <a href="../ch7/ch7-13.html">
            
                    
                    类型分支
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.14" data-path="../ch7/ch7-14.html">
            
                <a href="../ch7/ch7-14.html">
            
                    
                    示例: 基于标记的XML解码
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.15" data-path="../ch7/ch7-15.html">
            
                <a href="../ch7/ch7-15.html">
            
                    
                    补充几点
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.9" data-path="../ch8/ch8.html">
            
                <a href="../ch8/ch8.html">
            
                    
                    Goroutines和Channels
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.9.1" data-path="../ch8/ch8-01.html">
            
                <a href="../ch8/ch8-01.html">
            
                    
                    Goroutines
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.2" data-path="../ch8/ch8-02.html">
            
                <a href="../ch8/ch8-02.html">
            
                    
                    示例: 并发的Clock服务
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3" data-path="../ch8/ch8-03.html">
            
                <a href="../ch8/ch8-03.html">
            
                    
                    示例: 并发的Echo服务
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.4" data-path="../ch8/ch8-04.html">
            
                <a href="../ch8/ch8-04.html">
            
                    
                    Channels
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.5" data-path="../ch8/ch8-05.html">
            
                <a href="../ch8/ch8-05.html">
            
                    
                    并发的循环
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.6" data-path="../ch8/ch8-06.html">
            
                <a href="../ch8/ch8-06.html">
            
                    
                    示例: 并发的Web爬虫
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.7" data-path="../ch8/ch8-07.html">
            
                <a href="../ch8/ch8-07.html">
            
                    
                    基于select的多路复用
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.8" data-path="../ch8/ch8-08.html">
            
                <a href="../ch8/ch8-08.html">
            
                    
                    示例: 并发的目录遍历
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.9" data-path="../ch8/ch8-09.html">
            
                <a href="../ch8/ch8-09.html">
            
                    
                    并发的退出
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.10" data-path="../ch8/ch8-10.html">
            
                <a href="../ch8/ch8-10.html">
            
                    
                    示例: 聊天服务
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.10" data-path="../ch9/ch9.html">
            
                <a href="../ch9/ch9.html">
            
                    
                    基于共享变量的并发
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.10.1" data-path="../ch9/ch9-01.html">
            
                <a href="../ch9/ch9-01.html">
            
                    
                    竞争条件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.2" data-path="../ch9/ch9-02.html">
            
                <a href="../ch9/ch9-02.html">
            
                    
                    sync.Mutex互斥锁
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.3" data-path="../ch9/ch9-03.html">
            
                <a href="../ch9/ch9-03.html">
            
                    
                    sync.RWMutex读写锁
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.4" data-path="../ch9/ch9-04.html">
            
                <a href="../ch9/ch9-04.html">
            
                    
                    内存同步
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.5" data-path="../ch9/ch9-05.html">
            
                <a href="../ch9/ch9-05.html">
            
                    
                    sync.Once惰性初始化
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.6" data-path="../ch9/ch9-06.html">
            
                <a href="../ch9/ch9-06.html">
            
                    
                    竞争条件检测
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.7" data-path="../ch9/ch9-07.html">
            
                <a href="../ch9/ch9-07.html">
            
                    
                    示例: 并发的非阻塞缓存
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.8" data-path="../ch9/ch9-08.html">
            
                <a href="../ch9/ch9-08.html">
            
                    
                    Goroutines和线程
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.11" data-path="../ch10/ch10.html">
            
                <a href="../ch10/ch10.html">
            
                    
                    包和工具
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.11.1" data-path="../ch10/ch10-01.html">
            
                <a href="../ch10/ch10-01.html">
            
                    
                    包简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.2" data-path="../ch10/ch10-02.html">
            
                <a href="../ch10/ch10-02.html">
            
                    
                    导入路径
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.3" data-path="../ch10/ch10-03.html">
            
                <a href="../ch10/ch10-03.html">
            
                    
                    包声明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.4" data-path="../ch10/ch10-04.html">
            
                <a href="../ch10/ch10-04.html">
            
                    
                    导入声明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.5" data-path="../ch10/ch10-05.html">
            
                <a href="../ch10/ch10-05.html">
            
                    
                    包的匿名导入
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.6" data-path="../ch10/ch10-06.html">
            
                <a href="../ch10/ch10-06.html">
            
                    
                    包和命名
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.7" data-path="../ch10/ch10-07.html">
            
                <a href="../ch10/ch10-07.html">
            
                    
                    工具
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.12" data-path="../ch11/ch11.html">
            
                <a href="../ch11/ch11.html">
            
                    
                    测试
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.12.1" data-path="../ch11/ch11-01.html">
            
                <a href="../ch11/ch11-01.html">
            
                    
                    go test
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.2" data-path="../ch11/ch11-02.html">
            
                <a href="../ch11/ch11-02.html">
            
                    
                    测试函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.3" data-path="../ch11/ch11-03.html">
            
                <a href="../ch11/ch11-03.html">
            
                    
                    测试覆盖率
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.4" data-path="../ch11/ch11-04.html">
            
                <a href="../ch11/ch11-04.html">
            
                    
                    基准测试
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.5" data-path="../ch11/ch11-05.html">
            
                <a href="../ch11/ch11-05.html">
            
                    
                    剖析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.6" data-path="../ch11/ch11-06.html">
            
                <a href="../ch11/ch11-06.html">
            
                    
                    示例函数
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.13" data-path="../ch12/ch12.html">
            
                <a href="../ch12/ch12.html">
            
                    
                    反射
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.13.1" data-path="../ch12/ch12-01.html">
            
                <a href="../ch12/ch12-01.html">
            
                    
                    为何需要反射?
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.2" data-path="../ch12/ch12-02.html">
            
                <a href="../ch12/ch12-02.html">
            
                    
                    reflect.Type和reflect.Value
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.3" data-path="../ch12/ch12-03.html">
            
                <a href="../ch12/ch12-03.html">
            
                    
                    Display递归打印
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.4" data-path="../ch12/ch12-04.html">
            
                <a href="../ch12/ch12-04.html">
            
                    
                    示例: 编码S表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.5" data-path="../ch12/ch12-05.html">
            
                <a href="../ch12/ch12-05.html">
            
                    
                    通过reflect.Value修改值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.6" data-path="../ch12/ch12-06.html">
            
                <a href="../ch12/ch12-06.html">
            
                    
                    示例: 解码S表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.7" data-path="../ch12/ch12-07.html">
            
                <a href="../ch12/ch12-07.html">
            
                    
                    获取结构体字段标签
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.8" data-path="../ch12/ch12-08.html">
            
                <a href="../ch12/ch12-08.html">
            
                    
                    显示一个类型的方法集
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.9" data-path="../ch12/ch12-09.html">
            
                <a href="../ch12/ch12-09.html">
            
                    
                    几点忠告
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.14" data-path="../ch13/ch13.html">
            
                <a href="../ch13/ch13.html">
            
                    
                    底层编程
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.14.1" data-path="../ch13/ch13-01.html">
            
                <a href="../ch13/ch13-01.html">
            
                    
                    unsafe.Sizeof, Alignof 和 Offsetof
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.2" data-path="../ch13/ch13-02.html">
            
                <a href="../ch13/ch13-02.html">
            
                    
                    unsafe.Pointer
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.3" data-path="../ch13/ch13-03.html">
            
                <a href="../ch13/ch13-03.html">
            
                    
                    示例: 深度相等判断
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.4" data-path="../ch13/ch13-04.html">
            
                <a href="../ch13/ch13-04.html">
            
                    
                    通过cgo调用C代码
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.5" data-path="../ch13/ch13-05.html">
            
                <a href="../ch13/ch13-05.html">
            
                    
                    几点忠告
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.15" data-path="../appendix/appendix.html">
            
                <a href="../appendix/appendix.html">
            
                    
                    附录
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.15.1" data-path="../appendix/appendix-a-errata.html">
            
                <a href="../appendix/appendix-a-errata.html">
            
                    
                    附录A：原文勘误
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.15.2" data-path="../appendix/appendix-b-author.html">
            
                <a href="../appendix/appendix-b-author.html">
            
                    
                    附录B：作者译者
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.15.3" data-path="../appendix/appendix-c-cpoyright.html">
            
                <a href="../appendix/appendix-c-cpoyright.html">
            
                    
                    附录C：译文授权
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.15.4" data-path="../appendix/appendix-d-translations.html">
            
                <a href="../appendix/appendix-d-translations.html">
            
                    
                    附录D：其它语言
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    

    <li class="divider"></li>

    <li>
        <a href="https://www.gitbook.com" target="blank" class="gitbook-link">
            本书使用 GitBook 发布
        </a>
    </li>
</ul>


                </nav>
            
        
    </div>

    <div class="book-body">
        
            <div class="body-inner">
                
                    

<div class="book-header" role="navigation">
    

    <!-- Title -->
    <h1>
        <i class="fa fa-circle-o-notch fa-spin"></i>
        <a href=".." >GIF动画</a>
    </h1>
</div>




                    <div class="page-wrapper" tabindex="-1" role="main">
                        <div class="page-inner">
                            
                                <section class="normal markdown-section">
                                
                                <h2 id="14-gif&#x52A8;&#x753B;">1.4. GIF&#x52A8;&#x753B;</h2>
<p>&#x4E0B;&#x9762;&#x7684;&#x7A0B;&#x5E8F;&#x4F1A;&#x6F14;&#x793A;Go&#x8BED;&#x8A00;&#x6807;&#x51C6;&#x5E93;&#x91CC;&#x7684;image&#x8FD9;&#x4E2A;package&#x7684;&#x7528;&#x6CD5;&#xFF0C;&#x6211;&#x4EEC;&#x4F1A;&#x7528;&#x8FD9;&#x4E2A;&#x5305;&#x6765;&#x751F;&#x6210;&#x4E00;&#x7CFB;&#x5217;&#x7684;bit-mapped&#x56FE;&#xFF0C;&#x7136;&#x540E;&#x5C06;&#x8FD9;&#x4E9B;&#x56FE;&#x7247;&#x7F16;&#x7801;&#x4E3A;&#x4E00;&#x4E2A;GIF&#x52A8;&#x753B;&#x3002;&#x6211;&#x4EEC;&#x751F;&#x6210;&#x7684;&#x56FE;&#x5F62;&#x540D;&#x5B57;&#x53EB;&#x5229;&#x8428;&#x5982;&#x56FE;&#x5F62;&#xFF08;Lissajous figures&#xFF09;&#xFF0C;&#x8FD9;&#x79CD;&#x6548;&#x679C;&#x662F;&#x5728;1960&#x5E74;&#x4EE3;&#x7684;&#x8001;&#x7535;&#x5F71;&#x91CC;&#x51FA;&#x73B0;&#x7684;&#x4E00;&#x79CD;&#x89C6;&#x89C9;&#x7279;&#x6548;&#x3002;&#x5B83;&#x4EEC;&#x662F;&#x534F;&#x632F;&#x5B50;&#x5728;&#x4E24;&#x4E2A;&#x7EAC;&#x5EA6;&#x4E0A;&#x632F;&#x52A8;&#x6240;&#x4EA7;&#x751F;&#x7684;&#x66F2;&#x7EBF;&#xFF0C;&#x6BD4;&#x5982;&#x4E24;&#x4E2A;sin&#x6B63;&#x5F26;&#x6CE2;&#x5206;&#x522B;&#x5728;x&#x8F74;&#x548C;y&#x8F74;&#x8F93;&#x5165;&#x4F1A;&#x4EA7;&#x751F;&#x7684;&#x66F2;&#x7EBF;&#x3002;&#x56FE;1.1&#x662F;&#x8FD9;&#x6837;&#x7684;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#xFF1A;</p>
<p><img src="../images/ch1-01.png" alt=""></p>
<p>&#x8BD1;&#x6CE8;&#xFF1A;&#x8981;&#x770B;&#x8FD9;&#x4E2A;&#x7A0B;&#x5E8F;&#x7684;&#x7ED3;&#x679C;&#xFF0C;&#x9700;&#x8981;&#x5C06;&#x6807;&#x51C6;&#x8F93;&#x51FA;&#x91CD;&#x5B9A;&#x5411;&#x5230;&#x4E00;&#x4E2A;GIF&#x56FE;&#x50CF;&#x6587;&#x4EF6;&#xFF08;&#x4F7F;&#x7528; <code>./lissajous &gt; output.gif</code> &#x547D;&#x4EE4;&#xFF09;&#x3002;&#x4E0B;&#x9762;&#x662F;GIF&#x56FE;&#x50CF;&#x52A8;&#x753B;&#x6548;&#x679C;&#xFF1A;</p>
<p><img src="../images/ch1-01.gif" alt=""></p>
<p>&#x8FD9;&#x6BB5;&#x4EE3;&#x7801;&#x91CC;&#x6211;&#x4EEC;&#x7528;&#x4E86;&#x4E00;&#x4E9B;&#x65B0;&#x7684;&#x7ED3;&#x6784;&#xFF0C;&#x5305;&#x62EC;const&#x58F0;&#x660E;&#xFF0C;struct&#x7ED3;&#x6784;&#x4F53;&#x7C7B;&#x578B;&#xFF0C;&#x590D;&#x5408;&#x58F0;&#x660E;&#x3002;&#x548C;&#x6211;&#x4EEC;&#x4E3E;&#x7684;&#x5176;&#x5B83;&#x7684;&#x4F8B;&#x5B50;&#x4E0D;&#x592A;&#x4E00;&#x6837;&#xFF0C;&#x8FD9;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x5305;&#x542B;&#x4E86;&#x6D6E;&#x70B9;&#x6570;&#x8FD0;&#x7B97;&#x3002;&#x8FD9;&#x4E9B;&#x6982;&#x5FF5;&#x6211;&#x4EEC;&#x53EA;&#x5728;&#x8FD9;&#x91CC;&#x7B80;&#x5355;&#x5730;&#x8BF4;&#x660E;&#x4E00;&#x4E0B;&#xFF0C;&#x4E4B;&#x540E;&#x7684;&#x7AE0;&#x8282;&#x4F1A;&#x66F4;&#x8BE6;&#x7EC6;&#x5730;&#x8BB2;&#x89E3;&#x3002;</p>
<p><u><i>gopl.io/ch1/lissajous</i></u></p>
<pre><code class="lang-go"><span class="hljs-comment">// Lissajous generates GIF animations of random Lissajous figures.</span>
<span class="hljs-keyword">package</span> main

<span class="hljs-keyword">import</span> (
    <span class="hljs-string">&quot;image&quot;</span>
    <span class="hljs-string">&quot;image/color&quot;</span>
    <span class="hljs-string">&quot;image/gif&quot;</span>
    <span class="hljs-string">&quot;io&quot;</span>
    <span class="hljs-string">&quot;math&quot;</span>
    <span class="hljs-string">&quot;math/rand&quot;</span>
    <span class="hljs-string">&quot;os&quot;</span>
    <span class="hljs-string">&quot;time&quot;</span>
)

<span class="hljs-keyword">var</span> palette = []color.Color{color.White, color.Black}

<span class="hljs-keyword">const</span> (
    whiteIndex = <span class="hljs-number">0</span> <span class="hljs-comment">// first color in palette</span>
    blackIndex = <span class="hljs-number">1</span> <span class="hljs-comment">// next color in palette</span>
)

<span class="hljs-keyword">func</span> main() {
    <span class="hljs-comment">// The sequence of images is deterministic unless we seed</span>
    <span class="hljs-comment">// the pseudo-random number generator using the current time.</span>
    <span class="hljs-comment">// Thanks to Randall McPherson for pointing out the omission.</span>
    rand.Seed(time.Now().UTC().UnixNano())
    lissajous(os.Stdout)
}

<span class="hljs-keyword">func</span> lissajous(out io.Writer) {
    <span class="hljs-keyword">const</span> (
        cycles  = <span class="hljs-number">5</span>     <span class="hljs-comment">// number of complete x oscillator revolutions</span>
        res     = <span class="hljs-number">0.001</span> <span class="hljs-comment">// angular resolution</span>
        size    = <span class="hljs-number">100</span>   <span class="hljs-comment">// image canvas covers [-size..+size]</span>
        nframes = <span class="hljs-number">64</span>    <span class="hljs-comment">// number of animation frames</span>
        delay   = <span class="hljs-number">8</span>     <span class="hljs-comment">// delay between frames in 10ms units</span>
    )

    freq := rand.Float64() * <span class="hljs-number">3.0</span> <span class="hljs-comment">// relative frequency of y oscillator</span>
    anim := gif.GIF{LoopCount: nframes}
    phase := <span class="hljs-number">0.0</span> <span class="hljs-comment">// phase difference</span>
    <span class="hljs-keyword">for</span> i := <span class="hljs-number">0</span>; i &lt; nframes; i++ {
        rect := image.Rect(<span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">2</span>*size+<span class="hljs-number">1</span>, <span class="hljs-number">2</span>*size+<span class="hljs-number">1</span>)
        img := image.NewPaletted(rect, palette)
        <span class="hljs-keyword">for</span> t := <span class="hljs-number">0.0</span>; t &lt; cycles*<span class="hljs-number">2</span>*math.Pi; t += res {
            x := math.Sin(t)
            y := math.Sin(t*freq + phase)
            img.SetColorIndex(size+<span class="hljs-keyword">int</span>(x*size+<span class="hljs-number">0.5</span>), size+<span class="hljs-keyword">int</span>(y*size+<span class="hljs-number">0.5</span>),
                blackIndex)
        }
        phase += <span class="hljs-number">0.1</span>
        anim.Delay = <span class="hljs-built_in">append</span>(anim.Delay, delay)
        anim.Image = <span class="hljs-built_in">append</span>(anim.Image, img)
    }
    gif.EncodeAll(out, &amp;anim) <span class="hljs-comment">// <span class="hljs-doctag">NOTE:</span> ignoring encoding errors</span>
}
</code></pre>
<p>&#x5F53;&#x6211;&#x4EEC;import&#x4E86;&#x4E00;&#x4E2A;&#x5305;&#x8DEF;&#x5F84;&#x5305;&#x542B;&#x6709;&#x591A;&#x4E2A;&#x5355;&#x8BCD;&#x7684;package&#x65F6;&#xFF0C;&#x6BD4;&#x5982;image/color&#xFF08;image&#x548C;color&#x4E24;&#x4E2A;&#x5355;&#x8BCD;&#xFF09;&#xFF0C;&#x901A;&#x5E38;&#x6211;&#x4EEC;&#x53EA;&#x9700;&#x8981;&#x7528;&#x6700;&#x540E;&#x90A3;&#x4E2A;&#x5355;&#x8BCD;&#x8868;&#x793A;&#x8FD9;&#x4E2A;&#x5305;&#x5C31;&#x53EF;&#x4EE5;&#x3002;&#x6240;&#x4EE5;&#x5F53;&#x6211;&#x4EEC;&#x5199;color.White&#x65F6;&#xFF0C;&#x8FD9;&#x4E2A;&#x53D8;&#x91CF;&#x6307;&#x5411;&#x7684;&#x662F;image/color&#x5305;&#x91CC;&#x7684;&#x53D8;&#x91CF;&#xFF0C;&#x540C;&#x7406;gif.GIF&#x662F;&#x5C5E;&#x4E8E;image/gif&#x5305;&#x91CC;&#x7684;&#x53D8;&#x91CF;&#x3002;</p>
<p>&#x8FD9;&#x4E2A;&#x7A0B;&#x5E8F;&#x91CC;&#x7684;&#x5E38;&#x91CF;&#x58F0;&#x660E;&#x7ED9;&#x51FA;&#x4E86;&#x4E00;&#x7CFB;&#x5217;&#x7684;&#x5E38;&#x91CF;&#x503C;&#xFF0C;&#x5E38;&#x91CF;&#x662F;&#x6307;&#x5728;&#x7A0B;&#x5E8F;&#x7F16;&#x8BD1;&#x540E;&#x8FD0;&#x884C;&#x65F6;&#x59CB;&#x7EC8;&#x90FD;&#x4E0D;&#x4F1A;&#x53D8;&#x5316;&#x7684;&#x503C;&#xFF0C;&#x6BD4;&#x5982;&#x5708;&#x6570;&#x3001;&#x5E27;&#x6570;&#x3001;&#x5EF6;&#x8FDF;&#x503C;&#x3002;&#x5E38;&#x91CF;&#x58F0;&#x660E;&#x548C;&#x53D8;&#x91CF;&#x58F0;&#x660E;&#x4E00;&#x822C;&#x90FD;&#x4F1A;&#x51FA;&#x73B0;&#x5728;&#x5305;&#x7EA7;&#x522B;&#xFF0C;&#x6240;&#x4EE5;&#x8FD9;&#x4E9B;&#x5E38;&#x91CF;&#x5728;&#x6574;&#x4E2A;&#x5305;&#x4E2D;&#x90FD;&#x662F;&#x53EF;&#x4EE5;&#x5171;&#x4EAB;&#x7684;&#xFF0C;&#x6216;&#x8005;&#x4F60;&#x4E5F;&#x53EF;&#x4EE5;&#x628A;&#x5E38;&#x91CF;&#x58F0;&#x660E;&#x5B9A;&#x4E49;&#x5728;&#x51FD;&#x6570;&#x4F53;&#x5185;&#x90E8;&#xFF0C;&#x90A3;&#x4E48;&#x8FD9;&#x79CD;&#x5E38;&#x91CF;&#x5C31;&#x53EA;&#x80FD;&#x5728;&#x51FD;&#x6570;&#x4F53;&#x5185;&#x7528;&#x3002;&#x76EE;&#x524D;&#x5E38;&#x91CF;&#x58F0;&#x660E;&#x7684;&#x503C;&#x5FC5;&#x987B;&#x662F;&#x4E00;&#x4E2A;&#x6570;&#x5B57;&#x503C;&#x3001;&#x5B57;&#x7B26;&#x4E32;&#x6216;&#x8005;&#x4E00;&#x4E2A;&#x56FA;&#x5B9A;&#x7684;boolean&#x503C;&#x3002;</p>
<p>[]color.Color{...}&#x548C;gif.GIF{...}&#x8FD9;&#x4E24;&#x4E2A;&#x8868;&#x8FBE;&#x5F0F;&#x5C31;&#x662F;&#x6211;&#x4EEC;&#x8BF4;&#x7684;&#x590D;&#x5408;&#x58F0;&#x660E;&#xFF08;4.2&#x548C;4.4.1&#x8282;&#x6709;&#x8BF4;&#x660E;&#xFF09;&#x3002;&#x8FD9;&#x662F;&#x5B9E;&#x4F8B;&#x5316;Go&#x8BED;&#x8A00;&#x91CC;&#x7684;&#x590D;&#x5408;&#x7C7B;&#x578B;&#x7684;&#x4E00;&#x79CD;&#x5199;&#x6CD5;&#x3002;&#x8FD9;&#x91CC;&#x7684;&#x524D;&#x8005;&#x751F;&#x6210;&#x7684;&#x662F;&#x4E00;&#x4E2A;slice&#x5207;&#x7247;&#xFF0C;&#x540E;&#x8005;&#x751F;&#x6210;&#x7684;&#x662F;&#x4E00;&#x4E2A;struct&#x7ED3;&#x6784;&#x4F53;&#x3002;</p>
<p>gif.GIF&#x662F;&#x4E00;&#x4E2A;struct&#x7C7B;&#x578B;&#xFF08;&#x53C2;&#x8003;4.4&#x8282;&#xFF09;&#x3002;struct&#x662F;&#x4E00;&#x7EC4;&#x503C;&#x6216;&#x8005;&#x53EB;&#x5B57;&#x6BB5;&#x7684;&#x96C6;&#x5408;&#xFF0C;&#x4E0D;&#x540C;&#x7684;&#x7C7B;&#x578B;&#x96C6;&#x5408;&#x5728;&#x4E00;&#x4E2A;struct&#x53EF;&#x4EE5;&#x8BA9;&#x6211;&#x4EEC;&#x4EE5;&#x4E00;&#x4E2A;&#x7EDF;&#x4E00;&#x7684;&#x5355;&#x5143;&#x8FDB;&#x884C;&#x5904;&#x7406;&#x3002;anim&#x662F;&#x4E00;&#x4E2A;gif.GIF&#x7C7B;&#x578B;&#x7684;struct&#x53D8;&#x91CF;&#x3002;&#x8FD9;&#x79CD;&#x5199;&#x6CD5;&#x4F1A;&#x751F;&#x6210;&#x4E00;&#x4E2A;struct&#x53D8;&#x91CF;&#xFF0C;&#x5E76;&#x4E14;&#x5176;&#x5185;&#x90E8;&#x53D8;&#x91CF;LoopCount&#x5B57;&#x6BB5;&#x4F1A;&#x88AB;&#x8BBE;&#x7F6E;&#x4E3A;nframes&#xFF1B;&#x800C;&#x5176;&#x5B83;&#x7684;&#x5B57;&#x6BB5;&#x4F1A;&#x88AB;&#x8BBE;&#x7F6E;&#x4E3A;&#x5404;&#x81EA;&#x7C7B;&#x578B;&#x9ED8;&#x8BA4;&#x7684;&#x96F6;&#x503C;&#x3002;struct&#x5185;&#x90E8;&#x7684;&#x53D8;&#x91CF;&#x53EF;&#x4EE5;&#x4EE5;&#x4E00;&#x4E2A;&#x70B9;&#xFF08;.&#xFF09;&#x6765;&#x8FDB;&#x884C;&#x8BBF;&#x95EE;&#xFF0C;&#x5C31;&#x50CF;&#x5728;&#x6700;&#x540E;&#x4E24;&#x4E2A;&#x8D4B;&#x503C;&#x8BED;&#x53E5;&#x4E2D;&#x663E;&#x5F0F;&#x5730;&#x66F4;&#x65B0;&#x4E86;anim&#x8FD9;&#x4E2A;struct&#x7684;Delay&#x548C;Image&#x5B57;&#x6BB5;&#x3002;</p>
<p>lissajous&#x51FD;&#x6570;&#x5185;&#x90E8;&#x6709;&#x4E24;&#x5C42;&#x5D4C;&#x5957;&#x7684;for&#x5FAA;&#x73AF;&#x3002;&#x5916;&#x5C42;&#x5FAA;&#x73AF;&#x4F1A;&#x5FAA;&#x73AF;64&#x6B21;&#xFF0C;&#x6BCF;&#x4E00;&#x6B21;&#x90FD;&#x4F1A;&#x751F;&#x6210;&#x4E00;&#x4E2A;&#x5355;&#x72EC;&#x7684;&#x52A8;&#x753B;&#x5E27;&#x3002;&#x5B83;&#x751F;&#x6210;&#x4E86;&#x4E00;&#x4E2A;&#x5305;&#x542B;&#x4E24;&#x79CD;&#x989C;&#x8272;&#x7684;201*201&#x5927;&#x5C0F;&#x7684;&#x56FE;&#x7247;&#xFF0C;&#x767D;&#x8272;&#x548C;&#x9ED1;&#x8272;&#x3002;&#x6240;&#x6709;&#x50CF;&#x7D20;&#x70B9;&#x90FD;&#x4F1A;&#x88AB;&#x9ED8;&#x8BA4;&#x8BBE;&#x7F6E;&#x4E3A;&#x5176;&#x96F6;&#x503C;&#xFF08;&#x4E5F;&#x5C31;&#x662F;&#x8C03;&#x8272;&#x677F;palette&#x91CC;&#x7684;&#x7B2C;0&#x4E2A;&#x503C;&#xFF09;&#xFF0C;&#x8FD9;&#x91CC;&#x6211;&#x4EEC;&#x8BBE;&#x7F6E;&#x7684;&#x662F;&#x767D;&#x8272;&#x3002;&#x6BCF;&#x6B21;&#x5916;&#x5C42;&#x5FAA;&#x73AF;&#x90FD;&#x4F1A;&#x751F;&#x6210;&#x4E00;&#x5F20;&#x65B0;&#x56FE;&#x7247;&#xFF0C;&#x5E76;&#x5C06;&#x4E00;&#x4E9B;&#x50CF;&#x7D20;&#x8BBE;&#x7F6E;&#x4E3A;&#x9ED1;&#x8272;&#x3002;&#x5176;&#x7ED3;&#x679C;&#x4F1A;append&#x5230;&#x4E4B;&#x524D;&#x7ED3;&#x679C;&#x4E4B;&#x540E;&#x3002;&#x8FD9;&#x91CC;&#x6211;&#x4EEC;&#x7528;&#x5230;&#x4E86;append(&#x53C2;&#x8003;4.2.1)&#x5185;&#x7F6E;&#x51FD;&#x6570;&#xFF0C;&#x5C06;&#x7ED3;&#x679C;append&#x5230;anim&#x4E2D;&#x7684;&#x5E27;&#x5217;&#x8868;&#x672B;&#x5C3E;&#xFF0C;&#x5E76;&#x8BBE;&#x7F6E;&#x4E00;&#x4E2A;&#x9ED8;&#x8BA4;&#x7684;80ms&#x7684;&#x5EF6;&#x8FDF;&#x503C;&#x3002;&#x5FAA;&#x73AF;&#x7ED3;&#x675F;&#x540E;&#x6240;&#x6709;&#x7684;&#x5EF6;&#x8FDF;&#x503C;&#x88AB;&#x7F16;&#x7801;&#x8FDB;&#x4E86;GIF&#x56FE;&#x7247;&#x4E2D;&#xFF0C;&#x5E76;&#x5C06;&#x7ED3;&#x679C;&#x5199;&#x5165;&#x5230;&#x8F93;&#x51FA;&#x6D41;&#x3002;out&#x8FD9;&#x4E2A;&#x53D8;&#x91CF;&#x662F;io.Writer&#x7C7B;&#x578B;&#xFF0C;&#x8FD9;&#x4E2A;&#x7C7B;&#x578B;&#x652F;&#x6301;&#x628A;&#x8F93;&#x51FA;&#x7ED3;&#x679C;&#x5199;&#x5230;&#x5F88;&#x591A;&#x76EE;&#x6807;&#xFF0C;&#x5F88;&#x5FEB;&#x6211;&#x4EEC;&#x5C31;&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x4F8B;&#x5B50;&#x3002;</p>
<p>&#x5185;&#x5C42;&#x5FAA;&#x73AF;&#x8BBE;&#x7F6E;&#x4E24;&#x4E2A;&#x504F;&#x632F;&#x503C;&#x3002;x&#x8F74;&#x504F;&#x632F;&#x4F7F;&#x7528;sin&#x51FD;&#x6570;&#x3002;y&#x8F74;&#x504F;&#x632F;&#x4E5F;&#x662F;&#x6B63;&#x5F26;&#x6CE2;&#xFF0C;&#x4F46;&#x5176;&#x76F8;&#x5BF9;x&#x8F74;&#x7684;&#x504F;&#x632F;&#x662F;&#x4E00;&#x4E2A;0-3&#x7684;&#x968F;&#x673A;&#x503C;&#xFF0C;&#x521D;&#x59CB;&#x504F;&#x632F;&#x503C;&#x662F;&#x4E00;&#x4E2A;&#x96F6;&#x503C;&#xFF0C;&#x968F;&#x7740;&#x52A8;&#x753B;&#x7684;&#x6BCF;&#x4E00;&#x5E27;&#x9010;&#x6E10;&#x589E;&#x52A0;&#x3002;&#x5FAA;&#x73AF;&#x4F1A;&#x4E00;&#x76F4;&#x8DD1;&#x5230;x&#x8F74;&#x5B8C;&#x6210;&#x4E94;&#x6B21;&#x5B8C;&#x6574;&#x7684;&#x5FAA;&#x73AF;&#x3002;&#x6BCF;&#x4E00;&#x6B65;&#x5B83;&#x90FD;&#x4F1A;&#x8C03;&#x7528;SetColorIndex&#x6765;&#x4E3A;(x,y)&#x70B9;&#x6765;&#x67D3;&#x9ED1;&#x8272;&#x3002;</p>
<p>main&#x51FD;&#x6570;&#x8C03;&#x7528;lissajous&#x51FD;&#x6570;&#xFF0C;&#x7528;&#x5B83;&#x6765;&#x5411;&#x6807;&#x51C6;&#x8F93;&#x51FA;&#x6D41;&#x6253;&#x5370;&#x4FE1;&#x606F;&#xFF0C;&#x6240;&#x4EE5;&#x4E0B;&#x9762;&#x8FD9;&#x4E2A;&#x547D;&#x4EE4;&#x4F1A;&#x50CF;&#x56FE;1.1&#x4E2D;&#x4EA7;&#x751F;&#x4E00;&#x4E2A;GIF&#x52A8;&#x753B;&#x3002;</p>
<pre><code>$ go build gopl.io/ch1/lissajous
$ ./lissajous &gt;out.gif
</code></pre><p><strong>&#x7EC3;&#x4E60; 1.5&#xFF1A;</strong> &#x4FEE;&#x6539;&#x524D;&#x9762;&#x7684;Lissajous&#x7A0B;&#x5E8F;&#x91CC;&#x7684;&#x8C03;&#x8272;&#x677F;&#xFF0C;&#x7531;&#x9ED1;&#x8272;&#x6539;&#x4E3A;&#x7EFF;&#x8272;&#x3002;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x7528;<code>color.RGBA{0xRR, 0xGG, 0xBB, 0xff}</code>&#x6765;&#x5F97;&#x5230;<code>#RRGGBB</code>&#x8FD9;&#x4E2A;&#x8272;&#x503C;&#xFF0C;&#x4E09;&#x4E2A;&#x5341;&#x516D;&#x8FDB;&#x5236;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x5206;&#x522B;&#x4EE3;&#x8868;&#x7EA2;&#x3001;&#x7EFF;&#x3001;&#x84DD;&#x50CF;&#x7D20;&#x3002;</p>
<p><strong>&#x7EC3;&#x4E60; 1.6&#xFF1A;</strong> &#x4FEE;&#x6539;Lissajous&#x7A0B;&#x5E8F;&#xFF0C;&#x4FEE;&#x6539;&#x5176;&#x8C03;&#x8272;&#x677F;&#x6765;&#x751F;&#x6210;&#x66F4;&#x4E30;&#x5BCC;&#x7684;&#x989C;&#x8272;&#xFF0C;&#x7136;&#x540E;&#x4FEE;&#x6539;SetColorIndex&#x7684;&#x7B2C;&#x4E09;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x770B;&#x770B;&#x663E;&#x793A;&#x7ED3;&#x679C;&#x5427;&#x3002;</p>

                                
                                </section>
                            
                        </div>
                    </div>
                
            </div>

            
                
                <a href="ch1-03.html" class="navigation navigation-prev " aria-label="Previous page: 查找重复的行">
                    <i class="fa fa-angle-left"></i>
                </a>
                
                
                <a href="ch1-05.html" class="navigation navigation-next " aria-label="Next page: 获取URL">
                    <i class="fa fa-angle-right"></i>
                </a>
                
            
        
    </div>

    <script>
        var gitbook = gitbook || [];
        gitbook.push(function() {
            gitbook.page.hasChanged({"page":{"title":"GIF动画","level":"1.2.4","depth":2,"next":{"title":"获取URL","level":"1.2.5","depth":2,"path":"ch1/ch1-05.md","ref":"ch1/ch1-05.md","articles":[]},"previous":{"title":"查找重复的行","level":"1.2.3","depth":2,"path":"ch1/ch1-03.md","ref":"ch1/ch1-03.md","articles":[]},"dir":"ltr"},"config":{"plugins":["katex","-search","-lunr"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"katex":{},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"fontsettings":{"theme":"white","family":"sans","size":2},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"preface.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Go语言圣经","language":"zh-hans","gitbook":"3.x","description":"<The Go Programming Language>中文版"},"file":{"path":"ch1/ch1-04.md","mtime":"2020-08-13T07:15:34.326Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2020-08-13T07:17:23.922Z"},"basePath":"..","book":{"language":""}});
        });
    </script>
</div>

        
    <script src="../gitbook/gitbook.js"></script>
    <script src="../gitbook/theme.js"></script>
    
        
        <script src="../gitbook/gitbook-plugin-sharing/buttons.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
        
    

    </body>
</html>

